Page(
  { data: 
  { flag: 0, currentTab: 0 
  }, 
  switchNav: function (e) 
  { 
    var page = this; 
    var id = e.target.id; 
    if (this.data.currentTab == id) { 
      return false; 
      } else { 
        page.setData({ 
          currentTab: id 
          }); 
          } 
          page.setData({ flag: id }); 
          } 
        }
  )